1. Enough space: the biggest pocket can accommodate your laptop computer for additional pockets such as laptop accessories, such as tablet computers, mouse, MacBook mouse, mobile phone, headset, pen or memory card. It also provides enough space for the document. 2.-humid and lightweight: thin, light and convenient. Provide a mobile shoulder strap, which can be used as a shoulder strap or handbag according to your needs to be used for your daily use or business travel. It is suitable for men and women 3. Expansion design: increase the expansion zipper at the bottom, what should I do if there are too many items?the zipper, easily expand the capacity, and the amazing thickness can be visible 4. Select high -quality hardware accessories, dual zipper design, use more convenient work processing, strict lines of the line 5. Breathable shoulder pads, add pearl cotton inside, reduce shoulder pressure